The short answer
A SHSM dishwasher that leaks tells you where the fault is if you watch it. The table below carries two model codes for this family, close enough in build that the layout described here holds across both.
What you observe on these models
- Water at the door sill, on the floor in front of the machine — The seal, the door alignment, or suds. Look for foam at the sill: foam means detergent, not a part.
- Foam or suds visible at the bottom of the door — Hand dish soap, or far too much detergent, or a rinse-aid spill.
- Water appearing under the toe-kick only during a cycle — Something under the tub is wet while pressurised: a hose clamp, the pump seal, or the sump gasket.
- A slow puddle that is there even when the machine has not run — That is the supply side. The fill valve or its compression fitting weeps whether or not the machine is working, and it will not stop on its own.
- NEAR MISS — water standing inside the tub, floor dry — That is drainage, and it has its own page for this family.
Causes, most likely first on the SHSM family
- Over-sudsing from the wrong detergent — First on the list, and the most common cause in a household that is new to the machine.
- The door seal is hardened, torn or out of its channel — Second. Run a finger round the whole seal: a section standing proud of its channel, a tear at a corner, or a flat spot where the door has sat closed for years all leak in the same place.
- The door is out of alignment or the latch is not pulling it in — It ranks here on a narrow family because misalignment is usually introduced at installation — an out-of-square cabinet opening, or a panel fitted without resetting the hinge tension.
- The drain hose connection or the air gap is overflowing — Worth checking early despite its rank, because it is entirely outside the machine and the water it produces looks exactly like a tub leak once it reaches the floor.
- The tub seam or a spray arm feed has split — Last, and genuinely rare on units of this age. Reach it by elimination, never by assumption.
Check in this order, and why
- Dry the floor completely and put paper down — A sheet of kitchen paper across the sill and another under the toe-kick turns an invisible weep into a dated map.
- Look for foam before you look for a part — Foam at the sill means detergent. Run one rinse-only cycle with nothing in the cup and confirm the floor stays dry before you buy anything.
- Work round the door seal with a finger and a light — Feel for hard sections, tears at the corners and any length that has lifted out of its channel.
- Run a short cycle and watch the first ten minutes — Stay with it. A leak that starts at fill is the supply side; one that starts at the wash is the door or the sump; one that starts at the drain is the hose connection.
- Only then look under the toe-kick — Power off, panel off, torch in. A wet clamp, a wet sump seam or a stained pump body names the part — and names a job that needs the machine unseated.
Models in the SHSM family — Every code here is a pattern rather than a serial, so read yours as a stem: the trailing characters vary between production builds.
Reference| Model number | Family key |
|---|---|
| SHSM53B5** | bosch:dishwasher:shsm |
| SHSM63W5** | bosch:dishwasher:shsm |
Before you open anything
Safety
Shut the supply valve under the sink and switch off the breaker before anything goes under the machine; a capacitor can hold a charge after the power is off. Water that has been sitting under a cabinet reaches places that are meant to stay dry, so treat the area as live until the power is isolated.
When to call a technician
Call once you have located the leak below the tub, or if you cannot locate it at all after a watched cycle. A wet toe-kick with a dry sill is a sealed-side leak and it needs the machine out of the cabinet.
Sources — The symptom-report corpus recorded in this snapshot is what put this symptom on the page for this brand and appliance.
Documented- amazon-reviews — amazon-reviews, fetched 2026-09-02
Other symptoms covered for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
